Deeps is what the various settlements of the krait are called. Before being forced out of the Unending Ocean, the krait had lived in large pillared cities built around their obelisks that had towers stretching from the ocean floor to the surface up above, where air-breathing slaves were kept until used for sacrifice to their prophets. The structures were elaborate and built out of coral reefs and natural caverns. Their towers that breached the surface was often built out of wrecked ships and other stolen goods from raided lands.
After fleeing to Tyria, they had built many structures out of ship wreckage, many being small towers to hold and sacrifice slaves at.